/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.tencent.angel.worker;

import com.tencent.angel.common.Id;
import com.tencent.angel.exception.UnvalidIdStrException;

/**
 * The class for worker attempt id
 */
// TODO: 17/6/26 by zmyer
public class WorkerAttemptId extends Id {

    private static String WORKERATTEMPT = "WorkerAttempt";

    private WorkerId workerId;

    /**
     * Instantiates a new Worker attempt id.
     *
     * @param workerId the worker id
     * @param attemptIndex the attempt index
     */
    public WorkerAttemptId(WorkerId workerId, int attemptIndex) {
        super(attemptIndex);
        this.workerId = workerId;
    }

    /**
     * Instantiates a new Worker attempt id.
     * <p> the 'idStr' must match <code>WorkerAttempt_XXX_XXX_XXX</code>
     *
     * @param idStr the id str
     */
    public WorkerAttemptId(String idStr) throws UnvalidIdStrException {
        if (idStr == null) {
            throw new UnvalidIdStrException("id str can not be null");
        }

        String[] idElemts = idStr.split(SEPARATOR);
        if (idElemts.length != 4 || !idElemts[0].equals(WORKERATTEMPT)) {
            throw new UnvalidIdStrException("unvalid id str " + idStr + ", must be like this:" + WORKERATTEMPT
                + SEPARATOR + "workerGroupIndex" + SEPARATOR + "workerIndex" + SEPARATOR + "attemptIndex");
        }

        try {
            WorkerGroupId workerGroupId = new WorkerGroupId(Integer.valueOf(idElemts[1]));
            workerId = new WorkerId(workerGroupId, Integer.valueOf(idElemts[2]));
            index = Integer.valueOf(idElemts[3]);
        } catch (Exception x) {
            throw new UnvalidIdStrException("unvalid id str " + idStr + " " + x.getMessage()
                + ", must be like this:" + WORKERATTEMPT + SEPARATOR + "workerGroupIndex" + SEPARATOR
                + "workerIndex" + SEPARATOR + "attemptIndex");
        }
    }

    /**
     * Gets worker id.
     *
     * @return the worker id
     */
    public WorkerId getWorkerId() {
        return workerId;
    }

    private StringBuilder appendTo(StringBuilder builder) {
        return workerId.appendTo(builder).append(SEPARATOR).append(index);
    }

    @Override
    public String toString() {
        return appendTo(new StringBuilder(WORKERATTEMPT)).toString();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((workerId == null) ? 0 : workerId.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (getClass() != obj.getClass())
            return false;
        WorkerAttemptId other = (WorkerAttemptId) obj;
        if (workerId == null) {
            if (other.workerId != null)
                return false;
        } else if (!workerId.equals(other.workerId))
            return false;
        return true;
    }
}
